Huge cleanup. Group into sections: hardware feature detection, extension
detection/configuration, DDX options. Make building of Xorg DDX fully optional. Clarify and correct some help texts. Change all comments to use dnl instead of #. Quote all tests correctly, and guard pure-variable tests with 'x' (e.g. test $DMX = yes -> test "x$DMX" = xyes). Since the DDXes seem to have pretty divergent extension support these days, get rid of EXTENSION_LIBS, DMX_EXTENSIONS and XPRINT_EXTENSIONS, and go back to building extension lists by hand in the DDX-specific sections. Use portable POSIX constructs everywhere (e.g. test foo && test bar, instead of test foo -a bar). Clean up old cruft. Set _XSERVER64 on 64-bit architectures, and use x86_64 for host_cpu instead of amd64 (Jürg Billeter).
Showing with 584 additions and 630 deletions